After news of the guilty plea broke, Twitter erupted with a myriad of comments, memes and jokes.

US President Donald Trump's former national security adviser Michael Flynn pleaded guilty to lying to the FBI on Friday (1 December) and Twitter is mercilessly trolling him over it. In a dramatic development in special counsel Robert Mueller's probe into Russian interference in the 2016 election and possible collusion between Trump's team and Moscow, Flynn has agreed to cooperate fully with the investigation as part of his plea agreement.

He could face up to five years in prison over the charge.

Flynn is the first official that held a formal position in the Trump administration to be charged in the Mueller probe.

"The Special Counsel's investigation has breached the White House gates, reaching one of Pres. Trump's most trusted confidants and unmistakably implicating other top officials," Senator Richard Blumenthal tweeted.

"Make no mistake, #Flynn's betrayal of national security is an enduring black mark on our country's history and a stunning violation of his oath of office. Incredibly, he lied to the FBI while he was the President's chief national security adviser."

One person tweeted: "499: Number of days between when Michael Flynn led a 'Lock her up!' chant at the 2016 Republican Convention and pleading guilty of lying to the FBI."

With Christmas around the corner, many creatively came up with a few holiday carols using the hashtag #TrumpCarols to poke fun at the president in light of the news.

"What is happening now in the White House is exactly what you should expect when you elect a President that says 'I use the best words'," one user said.

Just in: Robert Mueller has charged former Trump national security advisor Michael Flynn with âwillfully and knowinglyâ making âfalse, fictitious and fraudulent statementsâ to the FBI regarding conversations with Russiaâs ambassador. pic.twitter.com/WqvDmytYiZ

1/ First, it's important to understand that Mueller has entered into a plea deal with Flynn in which Flynn pleads guilty to far less than the available evidence suggests he could be charged with. This indicates that he has cut a deal with Mueller to cooperate in the Russia probe.

6/ Deals like this are offered *only* when a witness can incriminate someone "higher up the food-chain" than them. In the case of the nation's former National Security Advisor, the *only* people above him in the executive-branch hierarchy are the President and the Vice President.

8/ What this indicatesâbeyond any serious doubtâis the following: Special Counsel Bob Mueller, the former Director of the FBI, believes Mike Flynn's testimony will *incriminate* the President of the United States, the Vice President of the United States, or both of these two men.

Michael Flynn issued a statement following his plea deal: "My guilty plea and agreement to cooperate with the Special Counsel's Office reflect a decision I made in the best interests of my family and our country." https://t.co/x3twTHJ4Wopic.twitter.com/2Ld2b27Owh

I think I can safely say that over the next few weeks we will be witnessing a most spectacular public circus, the likes of which we haven't yet seen. Trump will absolutely become more and more crazy and desperate with the possibility that he may be going to jail.